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In this tutorial, we are going to learn how to use a keypad, relay, and Arduino together. In detail, If a user inputs the password on the keypad correctly, Arduino turns the relay on.

The tutorial also provides the code that turns on a relay in a period of time and then turns off without using delay() function. The Arduino code also supports multiple passwords.

The below codes turn a relay on if the password is correct

  • Connect Arduino to PC via USB cable

  • Open Arduino IDE, select the right board and port

  • On Arduino IDE, Go to Tools Manage Libraries

  • Search “keypad”, then find the keypad library by Mark Stanley, Alexander Brevig

  • Click Install button to install keypad library.

  • Search “ezOutput”, then find the ezOutput library by ArduinoGetStarted

  • Click Install button to install ezOutput library.

  • Copy the above code and open with Arduino IDE

  • Click Upload button on Arduino IDE to upload code to Arduino

  • See the result on Serial Monitor and the state of relay

The password is incorrect, try again
The password is correct, turning ON relay

Authorized passwords are pre-defined in the Arduino code.

A string is used to store the password inputted by users, called input string. In keypad, two keys (* and #) are used for special purposes: clear password and terminate password. When a key on keypad is pressed:

  • If the pressed key is not two special keys, it is appended to the input string

  • If the pressed key is *, input string is clear. You can use it to start or re-start inputing the password

    • The input string is compared with the pre-defined passwords. If it matched with one of the pre-defined passwords, the relay is turned on.

    • No matter the password is correct or not, the input string is clear for the next input